US6446343B1 - Structure for improving efficiency of a movable jaw of a tree pruner - Google Patents
Structure for improving efficiency of a movable jaw of a tree pruner Download PDFInfo
- Publication number
- US6446343B1 US6446343B1 US09/904,121 US90412101A US6446343B1 US 6446343 B1 US6446343 B1 US 6446343B1 US 90412101 A US90412101 A US 90412101A US 6446343 B1 US6446343 B1 US 6446343B1
- Authority
- US
- United States
- Prior art keywords
- jaw
- fixed jaw
- movable jaw
- stop ridge
- movable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000000717 retained effect Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013138 pruning Methods 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G3/00—Cutting implements specially adapted for horticultural purposes; Delimbing standing trees
- A01G3/02—Secateurs; Flower or fruit shears
- A01G3/025—Secateurs; Flower or fruit shears having elongated or extended handles
- A01G3/0255—Tree pruners, i.e. pruning shears carried at the end of a pole
Definitions
- the present invention relates generally to a tree pruner, and more particularly to a structural improvement on a movable jaw of the tree pruner.
- the conventional tree pruner comprises a support rod, a base fastened with one end of the support rod, a fixed jaw fastened with the base, and a movable jaw pivoted with the fixed jaw.
- Such conventional tree pruner as described above is defective in design in that the moving range of the movable jaw is excessively long, thereby undermining the efficiency of the movable jaw.
- the primary objective of the present invention is to provide a tree pruner which is free of the deficiency of the conventional tree pruner described above.
- a tree pruner which comprises a support rod, a base mounted on the end of the support rod, a fixed jaw fastened with the base, and a movable jaw pivoted with the fixed jaw.
- the fixed jaw is provided with an arresting projection.
- the movable jaw is provided with a first stop ridge and a second stop ridge which is separated from the first stop ridge by a predetermined distance. The moving range of the movable jaw is confined by the first stop ridge and the second stop ridge in conjunction with the arresting projection of the fixed jaw.
- FIG. 1 shows a perspective view of a first preferred embodiment of the present invention.
- FIG. 2 shows an exploded view of the first preferred embodiment of the present invention.
- FIG. 3 shows a schematic view of the first preferred embodiment of the present invention in action.
- FIG. 4 shows another schematic view of the first preferred embodiment of the present invention in action.
- FIG. 5 shows a perspective view of a second preferred embodiment of the present invention.
- a tree pruner of the first preferred embodiment of the present invention comprises a support rod 05 , a base 10 , a fixed jaw 20 , and a movable jaw 30 .
- the base 10 is mounted on one end of the support rod 05 and is provided at the lower end with a first pulley 11 .
- the fixed jaw 20 is fastened at the lower end with the base 10 and is provided with a fixed jaw portion 21 .
- the fixed jaw 20 is further provided in one side of the midsegment thereof with a pivoting hole 22 and an arresting projection 23 which is located in proximity of the pivoting hole 22 .
- the fixed jaw 20 is further provided with a spring 24 whose one end is retained by the fixed jaw 20 .
- the movable jaw 30 has a blade 31 , an extension arm 32 , and a pivoting hole 33 corresponding in location to the pivoting hole 22 of the fixed jaw 20 .
- the extension arm 32 is provided at the free end with a second pulley 36 and a pull cord 37 which runs in the second pulley 36 and the first pulley 11 of the base 10 .
- the movable jaw 30 is provided with a first stop ridge 38 and a second stop ridge 39 which is separated from the first stop ridge 38 by a predetermined distance.
- the spring 24 is retained at other end thereof by the movable jaw 30 .
- the movable jaw 30 is pivotally fastened with the fixed jaw 20 by a bolt 34 and a nut 35 which is engaged with the bolt 34 .
- the bolt 34 is put through the pivoting hole 33 of the movable jaw 30 and the pivoting hole 22 of the fixed jaw 20 .
- the pull cord 37 is pulled to cause the blade 31 of the movable jaw 30 to move toward the fixed jaw portion 21 of the fixed jaw 20 so as to execute the cutting of a tree twig which is located between the blade 31 and the fixed jaw portion 21 .
- the movable jaw 30 has a moving range which is corresponding to the distance between the first stop ridge 38 and the second stop ridge 39 . In other words, the movement of the movable jaw 30 is confined by the first stop ridge 38 and the second stop ridge 39 in conjunction with the arresting projection 23 of the fixed jaw 20 .
- the blade 31 of the movable jaw 30 and the fixed jaw portion 21 of the fixed jaw 20 form an angle, as shown in FIG. 3 .
- the tree twig is held in the angle before the pull cord 37 is pulled.
- the blade 31 of the movable jaw 30 is actuated to move toward the fixed jaw portion 21 of the fixed jaw 20 , as shown in FIG. 4 .
- the severance of the tree twig is attained by a joint effort of the blade 31 of the movable jaw 30 and the fixed jaw portion 21 of the fixed jaw 20 .
- the pull cord 37 is let go to allow the blade 31 of the movable jaw 30 to move away from the fixed jaw portion 21 of the fixed jaw 20 by virtue of the spring force of the spring 24 .
- the return movement of the blade 31 of the movable jaw 30 is confined by the first stop ridge 38 of the movable jaw 30 in conjunction with the arresting projection 23 of the fixed jaw 20 , as shown in FIG. 3 .
- a tree pruner of the second preferred embodiment of the present invention is basically similar in construction to the tree pruner of the first preferred embodiment described above, except that the movable jaw 30 of the tree pruner of the second preferred embodiment of the present invention is provided with an arcuate guide slot 40 in place of the first stop ridge 38 and the second stop ridge 39 of the first preferred embodiment.
- one end of the arcuate guide slot 40 of the movable jaw 30 of the second preferred embodiment is functionally corresponding to the first stop ridge 38
- other end of the arcuate guide slot 40 is functionally corresponding to the second stop ridge 39 , as illustrated in FIG. 5 .
- the length of the arcuate guide slot 40 is corresponding to the distance between the first stop ridge 38 and the second stop ridge 39 .
- the pulling distance of the pull cord 37 is thus confined to make the chore of pruning a tree less tiresome.
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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Forests & Forestry (AREA)
- Environmental Sciences (AREA)
- Harvesting Machines For Specific Crops (AREA)
Abstract
A tree pruner comprises a support rod, a base mounted on one end of the support rod, a fixed jaw fastened with the base, and a movable jaw pivoted with the fixed jaw. The fixed jaw is provided with an arresting projection. The movable jaw is provided with a first stop ridge and a second stop ridge which is separated from the first stop ridge by a distance. The movement of the movable jaw is confined by the first stop ridge and the second stop ridge in conjunction with the arresting projection of the fixed jaw.
Description
1. Field of the Invention
The present invention relates generally to a tree pruner, and more particularly to a structural improvement on a movable jaw of the tree pruner.
2. Description of Related Art
The conventional tree pruner comprises a support rod, a base fastened with one end of the support rod, a fixed jaw fastened with the base, and a movable jaw pivoted with the fixed jaw. Such conventional tree pruner as described above is defective in design in that the moving range of the movable jaw is excessively long, thereby undermining the efficiency of the movable jaw.
The primary objective of the present invention is to provide a tree pruner which is free of the deficiency of the conventional tree pruner described above.
In keeping with the principle of the present invention, the foregoing objective of the present invention is attained by a tree pruner, which comprises a support rod, a base mounted on the end of the support rod, a fixed jaw fastened with the base, and a movable jaw pivoted with the fixed jaw. The fixed jaw is provided with an arresting projection. The movable jaw is provided with a first stop ridge and a second stop ridge which is separated from the first stop ridge by a predetermined distance. The moving range of the movable jaw is confined by the first stop ridge and the second stop ridge in conjunction with the arresting projection of the fixed jaw.
The foregoing objective, features, functions, and advantages of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings.
FIG. 1 shows a perspective view of a first preferred embodiment of the present invention.
FIG. 2 shows an exploded view of the first preferred embodiment of the present invention.
FIG. 3 shows a schematic view of the first preferred embodiment of the present invention in action.
FIG. 4 shows another schematic view of the first preferred embodiment of the present invention in action.
FIG. 5 shows a perspective view of a second preferred embodiment of the present invention.
As shown in FIGS. 1-4, a tree pruner of the first preferred embodiment of the present invention comprises a support rod 05, a base 10, a fixed jaw 20, and a movable jaw 30.
The base 10 is mounted on one end of the support rod 05 and is provided at the lower end with a first pulley 11.
The fixed jaw 20 is fastened at the lower end with the base 10 and is provided with a fixed jaw portion 21. The fixed jaw 20 is further provided in one side of the midsegment thereof with a pivoting hole 22 and an arresting projection 23 which is located in proximity of the pivoting hole 22. The fixed jaw 20 is further provided with a spring 24 whose one end is retained by the fixed jaw 20.
The movable jaw 30 has a blade 31, an extension arm 32, and a pivoting hole 33 corresponding in location to the pivoting hole 22 of the fixed jaw 20. The extension arm 32 is provided at the free end with a second pulley 36 and a pull cord 37 which runs in the second pulley 36 and the first pulley 11 of the base 10. The movable jaw 30 is provided with a first stop ridge 38 and a second stop ridge 39 which is separated from the first stop ridge 38 by a predetermined distance. The spring 24 is retained at other end thereof by the movable jaw 30.
In combination, the movable jaw 30 is pivotally fastened with the fixed jaw 20 by a bolt 34 and a nut 35 which is engaged with the bolt 34. The bolt 34 is put through the pivoting hole 33 of the movable jaw 30 and the pivoting hole 22 of the fixed jaw 20.
In operation, the pull cord 37 is pulled to cause the blade 31 of the movable jaw 30 to move toward the fixed jaw portion 21 of the fixed jaw 20 so as to execute the cutting of a tree twig which is located between the blade 31 and the fixed jaw portion 21. The movable jaw 30 has a moving range which is corresponding to the distance between the first stop ridge 38 and the second stop ridge 39. In other words, the movement of the movable jaw 30 is confined by the first stop ridge 38 and the second stop ridge 39 in conjunction with the arresting projection 23 of the fixed jaw 20. Before the pull cord 37 is pulled, the blade 31 of the movable jaw 30 and the fixed jaw portion 21 of the fixed jaw 20 form an angle, as shown in FIG. 3. The tree twig is held in the angle before the pull cord 37 is pulled. As the pull cord 37 is pulled, the blade 31 of the movable jaw 30 is actuated to move toward the fixed jaw portion 21 of the fixed jaw 20, as shown in FIG. 4. The severance of the tree twig is attained by a joint effort of the blade 31 of the movable jaw 30 and the fixed jaw portion 21 of the fixed jaw 20. Upon completion of the severance of the tree twig, the pull cord 37 is let go to allow the blade 31 of the movable jaw 30 to move away from the fixed jaw portion 21 of the fixed jaw 20 by virtue of the spring force of the spring 24. The return movement of the blade 31 of the movable jaw 30 is confined by the first stop ridge 38 of the movable jaw 30 in conjunction with the arresting projection 23 of the fixed jaw 20, as shown in FIG. 3.
As shown in FIG. 5, a tree pruner of the second preferred embodiment of the present invention is basically similar in construction to the tree pruner of the first preferred embodiment described above, except that the movable jaw 30 of the tree pruner of the second preferred embodiment of the present invention is provided with an arcuate guide slot 40 in place of the first stop ridge 38 and the second stop ridge 39 of the first preferred embodiment. However, one end of the arcuate guide slot 40 of the movable jaw 30 of the second preferred embodiment is functionally corresponding to the first stop ridge 38, whereas other end of the arcuate guide slot 40 is functionally corresponding to the second stop ridge 39, as illustrated in FIG. 5. In other words, the length of the arcuate guide slot 40 is corresponding to the distance between the first stop ridge 38 and the second stop ridge 39.
In light of the movement of the movable jaw 30 of the present invention being confined by the first stop ridge 38 and the second stop ridge 39, or the arcuate guide slot 40 in conjunction with the arresting projection 23 of the fixed jaw 20, the pulling distance of the pull cord 37 is thus confined to make the chore of pruning a tree less tiresome.
The embodiments of the present invention described above are to be regarded in all respects as being merely illustrative and not restrictive. Accordingly, the present invention may be embodied in other specific forms without deviating from the spirit thereof. The present invention is therefore to be limited only by the scopes of the following claims.
Claims (2)
1. A tree pruner comprising
a support rod;
a base fastened with one end of said support rod and provided with a first pulley fastened thereto;
a fixed jaw fastened at one end with said base and provided at other end with a fixed jaw portion, said fixed jaw further provided at a midsegment with a pivoting hole;
a movable jaw having at one end thereof a blade, and at other end thereof an extension arm which is provided at a free end thereof with a second pulley fastened thereto, said movable jaw provided with a pivoting hole corresponding in location to said pivoting hole of said fixed jaw, said movable jaw being pivoted with said fixed jaw by a bolt which is received in said pivoting hole of said movable jaw and said pivoting hole of said fixed jaw, with said blade of said movable jaw being opposite in location to said fixed jaw portion of said fixed jaw;
a spring retained at one end thereof by said fixed jaw, and at other end thereof by said movable jaw, said spring serving to provide said movable jaw with a spring force enabling said movable jaw to return to an original position thereof; and
a pull cord running through said first pulley of said base and said second pulley of said extension arm of said movable jaw;
wherein said fixed jaw is provided with an arresting projection; and wherein said movable jaw is provided with a first stop ridge, and a second stop ridge separated from said first stop ridge by a distance whereby movement of said movable jaw is confined to the distance between said first stop ridge and said second stop ridge such that said second stop ridge is stopped by said arresting projection of said fixed jaw in the course of movement of said blade toward said fixed jaw, and that said first stop ridge is stopped by said arresting projection of said fixed jaw in the course of movement of said blade away from said fixed jaw.
2. The tree pruner as defined in claim 1 , wherein said movable jaw is provided with an arcuate guide slot of a length, said guide slot having a first end and a second end whereby movement of said movable jaw is confined to the length between said first end and said second end such that said second end is stopped by said arresting projection of said fixed jaw in the course of movement of said blade toward said fixed jaw, and that said first end is stopped by said arresting projection of said fixed jaw in the course of movement of said blade away from said fixed jaw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/904,121 US6446343B1 (en) | 2001-07-13 | 2001-07-13 | Structure for improving efficiency of a movable jaw of a tree pruner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/904,121 US6446343B1 (en) | 2001-07-13 | 2001-07-13 | Structure for improving efficiency of a movable jaw of a tree pruner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US6446343B1 true US6446343B1 (en) | 2002-09-10 |
Family
ID=25418595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US09/904,121 Expired - Fee Related US6446343B1 (en) | 2001-07-13 | 2001-07-13 | Structure for improving efficiency of a movable jaw of a tree pruner |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US6446343B1 (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6671963B1 (en) * | 2002-06-05 | 2004-01-06 | Yu-Hsin Huang | Structure designed to detachably brace a blade portion and handle portion of a tree pruner |
| US20040098866A1 (en) * | 2002-11-25 | 2004-05-27 | Wang Kuang Pin | Tree pruner |
| FR2866522A1 (en) * | 2004-02-19 | 2005-08-26 | De Corny Emmanuel Ethis | Lopper device for cutting branch, has cutting blade in form of pruning knife and moving from top to bottom for penetrating branch from above so that lips of notch enlarges themselves, under weight of branch to facilitate knife penetration |
| US20100199502A1 (en) * | 2007-05-22 | 2010-08-12 | Fiskars Brands Finland Oy Ab | Pruning shears |
| US20100199503A1 (en) * | 2009-02-11 | 2010-08-12 | Pat Lorenson | Power line cutter |
| US20100223794A1 (en) * | 2009-03-03 | 2010-09-09 | Fiskars Brands, Inc. | Cutting tool with variable mechanical advantage |
| US20110192035A1 (en) * | 2010-02-09 | 2011-08-11 | Wen Ger Chen | Compound-action pruning tools |
| US8209871B1 (en) * | 2009-02-05 | 2012-07-03 | Palmby Chris D | Cutting apparatus |
| US8910386B2 (en) | 2011-05-02 | 2014-12-16 | Corona Clipper, Inc. | Multiple cut zone blade assembly for a hand operated cutting tool |
| CN104620871A (en) * | 2015-01-31 | 2015-05-20 | 兰州工业学院 | Fruit tree branch pruning machine |
| USD877579S1 (en) * | 2015-12-22 | 2020-03-10 | Fiskars Finland Oy Ab | Cutting tool for tree pruning |
| US20240049647A1 (en) * | 2022-08-15 | 2024-02-15 | Woodland Tools, Inc. | Tree pruner compact pin |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3835535A (en) * | 1973-08-20 | 1974-09-17 | Mc Donough Co | Pole pruner with improved cutting head |
| US4696107A (en) * | 1984-09-07 | 1987-09-29 | Wolf-Gerate Gmbh | Pruning shears |
| US4760645A (en) * | 1987-03-02 | 1988-08-02 | S.M.S. Industries, Inc. | Pole mounted pruning tool with adjustable length operating lever |
| US5743018A (en) * | 1997-03-07 | 1998-04-28 | Wang; Meng Tun | Pruning shear device |
| US5970617A (en) * | 1998-10-19 | 1999-10-26 | Chang; Jung-Hsien | Stepped tree pruner |
| US6385852B1 (en) * | 2001-06-14 | 2002-05-14 | Ho Cheng Garden Tools Co., Ltd. | Tree pruner |
-
2001
- 2001-07-13 US US09/904,121 patent/US6446343B1/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3835535A (en) * | 1973-08-20 | 1974-09-17 | Mc Donough Co | Pole pruner with improved cutting head |
| US4696107A (en) * | 1984-09-07 | 1987-09-29 | Wolf-Gerate Gmbh | Pruning shears |
| US4760645A (en) * | 1987-03-02 | 1988-08-02 | S.M.S. Industries, Inc. | Pole mounted pruning tool with adjustable length operating lever |
| US5743018A (en) * | 1997-03-07 | 1998-04-28 | Wang; Meng Tun | Pruning shear device |
| US5970617A (en) * | 1998-10-19 | 1999-10-26 | Chang; Jung-Hsien | Stepped tree pruner |
| US6385852B1 (en) * | 2001-06-14 | 2002-05-14 | Ho Cheng Garden Tools Co., Ltd. | Tree pruner |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6671963B1 (en) * | 2002-06-05 | 2004-01-06 | Yu-Hsin Huang | Structure designed to detachably brace a blade portion and handle portion of a tree pruner |
| US20040098866A1 (en) * | 2002-11-25 | 2004-05-27 | Wang Kuang Pin | Tree pruner |
| GB2395679A (en) * | 2002-11-25 | 2004-06-02 | Kuang-Pin Wang | Tree pruner |
| US6785969B2 (en) * | 2002-11-25 | 2004-09-07 | Kuang Pin Wang | Tree pruner |
| GB2395679B (en) * | 2002-11-25 | 2005-06-01 | Kuang-Pin Wang | Tree pruner |
| FR2866522A1 (en) * | 2004-02-19 | 2005-08-26 | De Corny Emmanuel Ethis | Lopper device for cutting branch, has cutting blade in form of pruning knife and moving from top to bottom for penetrating branch from above so that lips of notch enlarges themselves, under weight of branch to facilitate knife penetration |
| US8220163B2 (en) * | 2007-05-22 | 2012-07-17 | Fiskars Brands Finlay Oy AB | Pruning shears |
| US20100199502A1 (en) * | 2007-05-22 | 2010-08-12 | Fiskars Brands Finland Oy Ab | Pruning shears |
| US8209871B1 (en) * | 2009-02-05 | 2012-07-03 | Palmby Chris D | Cutting apparatus |
| US20100199503A1 (en) * | 2009-02-11 | 2010-08-12 | Pat Lorenson | Power line cutter |
| US20100223794A1 (en) * | 2009-03-03 | 2010-09-09 | Fiskars Brands, Inc. | Cutting tool with variable mechanical advantage |
| US8046924B2 (en) * | 2009-03-03 | 2011-11-01 | Fiskars Brands, Inc. | Cutting tool with variable mechanical advantage |
| USRE45488E1 (en) * | 2009-03-03 | 2015-04-28 | Fiskars Brands, Inc. | Cutting tool with variable mechanic advantage |
| US20110192035A1 (en) * | 2010-02-09 | 2011-08-11 | Wen Ger Chen | Compound-action pruning tools |
| US8910386B2 (en) | 2011-05-02 | 2014-12-16 | Corona Clipper, Inc. | Multiple cut zone blade assembly for a hand operated cutting tool |
| CN104620871A (en) * | 2015-01-31 | 2015-05-20 | 兰州工业学院 | Fruit tree branch pruning machine |
| USD877579S1 (en) * | 2015-12-22 | 2020-03-10 | Fiskars Finland Oy Ab | Cutting tool for tree pruning |
| USD900565S1 (en) | 2015-12-22 | 2020-11-03 | Fiskars Finland Oy Ab | Cutting tool for tree pruning |
| US20240049647A1 (en) * | 2022-08-15 | 2024-02-15 | Woodland Tools, Inc. | Tree pruner compact pin |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: HO CHENG GARDEN TOOLS CO.,LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HUANG, YAO-CHUNG;REEL/FRAME:011985/0838 Effective date: 20010629 |
|
| REMI | Maintenance fee reminder mailed | ||
| LAPS | Lapse for failure to pay maintenance fees | ||
| STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
| FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20060910 |